Properties of water Flashcards
1
Q
Define density
A
mass per volume
2
Q
What does high density mean?
A
heavy for its size
3
Q
What does low density mean?
A
light for its size
4
Q
Density in water is ____ times greater than air
A
800
5
Q
What does high density in water allow for? (2)
A
- natural buoyancy
- good for generating thrust
6
Q
What does natural buoyancy mean?
A
- not sinking or floating
7
Q
What are 2 advantages to dense water?
A
- saves energy (buoyancy)
- pushing against dense water thrusts them foreward
8
Q
What is a major disadvantage to dense water?
A
- high resistance to motion (drag)
- holds fish back from gliding
9
Q
Define viscocity
A
- internal friction of water/molecular cohesion
10
Q
Viscosity of water is ___ times greater than air
A
50
11
Q
What are the major disadvantages of high viscosity in water?
A
- drag
- turbulence
12
Q
What are 2 adaptations to viscos water?
A
- streamlining
- high proportion of swimming muscles (able to generate thrust
13
Q
Define streamlining
A
- fusiform shape in aerodynamic
14
Q
What are 3 adaptations to overcome the fact that water is virtually incompressible?
A
- gills
- sound detection/transmission
- lateral line system
15
Q
What are gills/what do they do?
A
- ventilations
- gas exchange organ
- pump out water
16
Q
Sound in water moves ____ times faster than air
A
- 5
